#include <stdio.h>
#include <ctype.h>
#include <string.h>

int main() {
    char str[] = "Hello, World!";

    if (isalpha('1')) {
     printf("ok");
    }else{
     printf("no");

    }
    for (int i = 0; i < strlen(str); i++) {
        if (isalpha(str[i])) {
            printf("Character '%c' is alphabetic.\n", str[i]);
        } else if (isdigit(str[i])) {
            printf("Character '%c' is a digit.\n", str[i]);
        } else {
            printf("Character '%c' is not alphabetic or digit.\n", str[i]);
        }
    }
    return 0;
}
